What specific devices did Renault allegedly use to cheat emissions tests?

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Renault to Face Criminal Trial in France Over Diesel Emissions Cheating Allegations

Renault will stand trial in France on aggravated fraud charges concerning allegations that its diesel vehicles were equipped with devices designed to circumvent clean air regulations. This legal development places the French automaker in a similar position to Volkswagen, which faced charges in relation to the 'dieselgate' scandal that first emerged in September 2015. The core of the accusations against Renault centres on vehicles sold between 2009 and 2017, which prosecutors allege were fitted with systems capable of detecting emissions tests. These systems purportedly allowed the vehicles to meet regulatory thresholds during testing while emitting higher levels of pollutants under real-world driving conditions.
Alleged Cheating Mechanisms

Prosecutors contend that Renault vehicles sold between 2009 and 2017 were equipped with specific devices. These devices are alleged to have been instrumental in enabling the cars to recognise when they were undergoing emissions testing. Upon detection of such tests, the systems would apparently adjust to meet the required regulatory standards. However, under normal driving conditions, these same vehicles allegedly emitted more pollutants than permitted by clean air laws.
Impact of Increased Emissions

The alleged use of these devices is linked to a significant increase in atmospheric pollution, specifically concerning nitrogen oxides. According to prosecutors, these elevated levels of nitrogen oxides are suspected of contributing to the development of respiratory diseases in humans. This assertion highlights the public health implications tied to the emissions cheating allegations.
Renault's Defence and Legal Context

Renault Group has publicly stated its intention to defend its innocence and uphold the integrity of its employees. The company has pointed to a recent decision by the High Court in London that, according to Renault, largely exonerated it and four other carmakers from similar charges. Renault maintains that the operating limits of its emission control systems are designed to balance emissions reduction with driver safety, and it firmly disputes any wrongdoing. The company has also suggested that foreign hedge funds may be behind the investigation, seeking financial gain. The first procedural hearing for the Renault trial is slated for April 2027.

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What specific devices did Renault allegedly use to cheat emissions tests?

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